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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfd11411bdf03e8c20e788e3a446800cbe6eb20a7c427f2f8b0ed94c87ef937' 
  AND token = '9VKZcOW8QDgg4SrjQIZJMs5noWgiGfY0owCMRLvKB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}